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applicable categorical Pretreatment Standard. If 40 CFR Part 136 does not <br />contain sampling or analytical techniques for the pollutant in question, or <br />where the EPA determines that the Part 136 sampling and analytical, <br />techniques are inappropriate for the pollutant in question, sampling and <br />analyses shall be performed by using validated analytical methods or any <br />other applicable sampling and analytical procedures, including procedures <br />suggested by the Director or other parties approved by EPA.The Director <br />may require more sensitive analysis if reported pollutant concentrations <br />are not sufficient to determine compliance with Pretreatment Standards or <br />to determine if such Standards are necessary. <br />(2) Sample Collection <br />b. Except as indicated in Sections 3, c ands d below, the <br />User must collect samples using 24 -hour flow proportional <br />composite sampling techniques unless time - proportional composite <br />sampling or grab sampling is authorized by the Director. Where <br />time - proportional composite sampling or grab sampling is <br />authorized by the Director, the samples must be representative of <br />the discharge Using preteeels (ineluuding appropriate preser..etion) <br />speeified in 40 Gnv Pert 136 and apprepFiate vin idanee <br />u. —..le erel. samples eelleeted during a 24 hewn period m , be <br />eempesited prier to labereter., analysis as f llewsi f r . nide <br />laberatery or- in the field; fer volatile or-ganie eempounds and oil <br />and grease, the samples y he e sited in the labereter., Grab <br />samples met, he required to show eemplianee with Instantaneew.. <br />hixrits. <br />(w) Bypass <br />(4) Bypass Prohibition <br />(b) The Director may approve an anticipated bypass, after <br />